Police activity intensified Friday at the Arizona home of Nancy Guthrie, the 84-year-old mother of Today show anchor Savannah Guthrie, after investigators acted on a new tip from a neighbor that led to the towing of a vehicle and the removal of a wired device from the roof.

The renewed law-enforcement presence marked one of the most significant developments in a case that has steadily escalated from a missing-person report into a full criminal investigation drawing national attention.

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